using System;
using System.Windows.Forms;
using FBroSharp;             // ⚠️ CRITICAL! FBroSharpControl
using FBroSharp.Lib;         // ⚠️ CRITICAL! IFBroSharpBrowser, IFBroSharpFrame, IFBroSharpUseExtraData
using FBroSharp.Event;       // FBroSharpBrowserEvent
using FBroSharp.DataType;    // ⚠️ REQUIRED! Additional data types
using FBroSharp.Value;       // ⚠️ CRITICAL! IFBroSharpDictionaryValue, FBroSharpWindowsInfo, FBroSharpBrowserSetting, FBroSharpPopupfeatures
using FBroSharp.Const;       // FBroSharpTransitionType, FBroSharpWindowOpenDisposition

namespace FBroBrowserAutomation
{
    /// <summary>
    /// 浏览器事件处理器 - MANDATORY for browser creation
    /// ⚠️ CRITICAL: 必须创建单独的 BrowserEvent.cs 文件！
    /// </summary>
    public class BrowserEvent : FBroSharpBrowserEvent
    {
        private Form1 _form;

        public BrowserEvent(Form1 form)
        {
            _form = form;
        }

        /// <summary>
        /// ⚠️ REQUIRED: Browser created (TWO parameters!)
        /// </summary>
        public override void OnAfterCreated(IFBroSharpBrowser browser, IFBroSharpDictionaryValue extrainfo)
        {
            _form.UpdateStatus($"浏览器已就绪 (ID: {browser.GetIdentifier()})");
        }

        /// <summary>
        /// ⚠️ CRITICAL FOR SINGLE-WINDOW APPS: Popup control - Prevent new windows
        /// This method is MANDATORY for single-window applications!
        /// Without this, links with target="_blank" will open new browser windows.
        /// </summary>
        public override bool OnBeforePopup(
            IFBroSharpBrowser browser, 
            IFBroSharpFrame frame, 
            string target_url, 
            string target_frame_name,
            FBroSharpWindowOpenDisposition target_disposition, 
            bool user_gesture, 
            FBroSharpPopupfeatures popupFeatures, 
            ref FBroSharpWindowsInfo windowInfo,    // Note: ref parameter!
            ref FBroSharpBrowserSetting settings,   // Note: ref parameter!
            ref bool no_javascript_access, 
            IFBroSharpUseExtraData user_settings)
        {
            // Open in current window instead of new window
            frame.LoadURL(target_url);
            return true;  // true = block popup, false = allow popup
        }

        /// <summary>
        /// ⚠️ REQUIRED: Address changed
        /// </summary>
        public override void OnAddressChange(IFBroSharpBrowser browser, IFBroSharpFrame frame, string url)
        {
            if (frame.IsMain())
            {
                _form.UpdateUrlTextBox(url);
            }
        }

        /// <summary>
        /// ⚠️ REQUIRED: Title changed
        /// </summary>
        public override void OnTitleChange(IFBroSharpBrowser browser, string title)
        {
            _form.UpdateTitle(title);
        }

        /// <summary>
        /// ⚠️ REQUIRED: Loading state changed
        /// </summary>
        public override void OnLoadingStateChange(IFBroSharpBrowser browser, bool isLoading, bool canGoBack, bool canGoForward)
        {
            _form.UpdateNavigationButtons(canGoBack, canGoForward);
        }

        /// <summary>
        /// ⚠️ REQUIRED: Page load started
        /// </summary>
        public override void OnLoadStart(IFBroSharpBrowser browser, IFBroSharpFrame frame, FBroSharpTransitionType transition_type)
        {
            if (frame.IsMain())
            {
                _form.UpdateStatus("正在加载...");
            }
        }

        /// <summary>
        /// ⚠️ REQUIRED: Page load completed
        /// </summary>
        public override void OnLoadEnd(IFBroSharpBrowser browser, IFBroSharpFrame frame, int httpStatusCode)
        {
            if (frame.IsMain())
            {
                _form.UpdateStatus($"加载完成 (HTTP {httpStatusCode})");
            }
        }

        /// <summary>
        /// ⚠️ REQUIRED: Page load error (errorCode is int!)
        /// </summary>
        public override void OnLoadError(IFBroSharpBrowser browser, IFBroSharpFrame frame, 
            int errorCode, string errorText, string failedUrl)
        {
            if (frame.IsMain())
            {
                _form.UpdateStatus($"加载失败: {errorText} (错误代码: {errorCode})");
            }
        }

        /// <summary>
        /// ⚠️ REQUIRED: Before browser close
        /// </summary>
        public override void OnBeforeClose(IFBroSharpBrowser browser)
        {
            Console.WriteLine("浏览器即将关闭");
        }

        /// <summary>
        /// ⚠️ REQUIRED: Can browser close
        /// </summary>
        public override bool DoClose(IFBroSharpBrowser browser)
        {
            return false; // false = allow close
        }
    }
}

